I noticed you didn't get a reply.
I can't answer your question as I've never owned one but I'd like to; these are going to be my rules.
1. Service history is essential. I googled and found a chart of each model with the service intervals on it, one of the dealers, I think Vindis at Cambridge break down the prices as well.
2. I think you need the 1200s or r for the Gucci extras.
3. I think you need termi pipe or full system for the rolling thunder experience
4. I reckon there's a lot of geezers out there who buy a Ducati and don't service it as per the manufacturers guidelines, because they want to own it but not pay out then offload it, they run them for low mileage over a couple of years with no servicing.
I'm drawn to the older ones like the S4R or the Senna.
Looks like you are near Vindis, I hear they are nice guys.
Got my eye on a hypermotard 939sp.